Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
  • C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
  • C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
  • C07D235/24—Benzimidazoles; Hydrogenated benzimidazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
  • C07D235/26—Oxygen atoms
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B29/00—Monoazo dyes prepared by diazotising and coupling
  • C09B29/32—Monoazo dyes prepared by diazotising and coupling from coupling components containing a reactive methylene group
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B41/00—Special methods of performing the coupling reaction
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0001—Post-treatment of organic pigments or dyes
  • C09B67/0017—Influencing the physical properties by treatment with an acid, H2SO4
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0096—Purification; Precipitation; Filtration

Definitions

• the present invention is directed to 2-[[1-[[(2,3-dihydro-2-oxo-1 H-benzimidazol-5- yl)amino]carbonyl]-2-oxopropyl]azo]-benzoic acid (C.I. Pigment Yellow 151 )
• the pigment has high opacity and high color strength.
• US-A-4,024,124 describes monoazo acetoacetylaminobenzimidazolone pigments containing carboxy group.
• example 1 the preparation of C.I. Pigment Yellow 151 is disclosed.
• the crude pigment obtained by coupling in an aqueous medium is dried after isolation, powdered, refluxed for 2 hours in glacial acetic acid, suction-filtered, washed and dried.
• a pigment of soft grain, good tinctorial strength and clear shade is obtained in this manner.
• US-A-4,906,735 discloses an improved process for the manufacture of C.I. Pigment Yellow 151 by coupling the components in an aqueous medium in the presence of an oxethylation product of an alcohol or alcohol mixture having from 8 to 14 carbon atoms and 3 to 10 mols of ethylene oxide, and heating the aqueous pigment suspension after complete coupling.
• the pigment thus obtained avoids an after-treatment in anhydrous organic solvents.
• the pigment is obtained in a form, which can be compared with that of example 1 of US-A-4,042,124.
• the present invention relates to 2-[[1-[[(2,3-dihydro-2-oxo-1 H-benzimidazol-5- yl)amino]carbonyl]-2-oxopropyl]azo]-benzoic acid (C.I. Pigment Yellow 151 ): having ⁇ i ⁇ E * (black/white) in masstone below 22.0 ⁇
• the color strength of the compound (pigment) is 6 to 55 %, especially 10 to 36 % higher than the color strength of Hostaperm® Yellow H4G (Clariant AG) as standard in white reduction (5:95).
• FIG. 1 is a transmission electron micrograph (TEM) of Hostaperm® Yellow H4G (Clariant AG; 2-[[1 -[[(2,3-dihydro-2-oxo-1 H-benzimidazol-5-yl)amino]carbonyl]-2-oxopropyl]azo]- benzoic acid; C.I. Pigment Yellow 151 ).
• TEM transmission electron micrograph
• FIG. 2 is a TEM of 2-[[1-[[(2,3-dihydro-2-oxo-1 H-benzimidazol-5-yl)amino]carbonyl]-2- oxopropyl]azo]-benzoic acid (C.I. Pigment Yellow 151 ) according to the present invention.
• the pigment of the present invention has a cubic, or cuboidal particle form, whereas Hostaperm® Yellow H4G has a more rod-like particle form.
• the invention provides a process for the manufacture of the compound of the formula
• the thermal after-treatment is especially carried out at a pH of from 6.0 - 7.3, very especially 6.5 - 7.3.
• the preferably aqueous solutions or suspensions of the starting materials are fed to the reactor continuously, subsequently, or simultaneously and preferably in equivalent amounts.
• the classic process assistants such as resins, surfactants and other additives may likewise be used in the process of the invention.
• the starting material for the diazotization reaction is anthranilic acid (1-aminobenzene-2- carboxylic acid).
• the coupling component is 5-acetoacetylamino-benzimidazolone.
• the azo coupling is preferably carried out in aqueous solution, but it is also possible to use organic solvents, if appropriate mixed with water, for example aromatic hydrocarbons, hydrochlorocarbons, glycol ethers, nitriles, esters, dimethylformamide, tetramethylurea and N-methylpyrrolidone.
• organic solvents for example aromatic hydrocarbons, hydrochlorocarbons, glycol ethers, nitriles, esters, dimethylformamide, tetramethylurea and N-methylpyrrolidone.
• Diazotizations are carried out at temperatures of -15 to +80 °C, preferably -12 to +10 °C, and azo couplings at -10 to 90 °C, preferably at -5 to 40 °C.
• the diazotisation is carried out, for example, with a nitrite, for example an alkali metal nitrite, such as sodium nitrite, in a medium containing a mineral acid, for example in a medium containing hydrochloric acid, generally at temperatures of from -15 to 80°C, preferably from - 12 to 10°C. Excess nitrite is destroyed with standard scavengers such as urea or sulfamic acid.
• the coupling to the coupling component is effected in a manner known per se, at acidic or neutral to weakly alkaline pH values, for example a pH value of from 1 to 8, and temperatures of, for example, from -10 to 90°C, preferably from -5 to 40°C.
• a solution or suspension of the diazonium salt and a solution or suspension of the coupling component can be continuously, subsequently, or simultaneously introduced into a reactor and continuously mixed with each other therein and reacted.
• the process according to the invention is advantageously carried out by slowly adding a solution or suspension of the coupling component, especially a basic solution or suspension of the coupling component to a freshly prepared solution or suspension of the diazotised compound.
• a solution or suspension of the coupling component especially a basic solution or suspension of the coupling component
• the pH is maintained in the neutral range, for example at from pH 4.5 to 8, especially 4.5 to 7.0, very especially 6.1 to 7.0 by addition of an aqueous alkali metal hydroxide solution, such as sodium hydroxide solution.
• the resulting pigment suspension is stirred until the reaction is complete followed by the thermal aftertreatment.
• the product is isolated by filtration.
• the obtained presscake is dried in an oven with or without vacuum and finally pulverized or pulverized and sieved.
• the reactant solutions may be admixed with buffer solutions, preferably of organic acids and salts thereof, for example acetic acid/acetate buffer, citric acid/citrate buffer, or of inorganic acids and salts thereof, for example phosphoric acid/phosphate or carbonic acid/carbonate.
• buffer solutions preferably of organic acids and salts thereof, for example acetic acid/acetate buffer, citric acid/citrate buffer, or of inorganic acids and salts thereof, for example phosphoric acid/phosphate or carbonic acid/carbonate.
• sodium dihydrogenphosphate, or sodium acetate is added to the diazo solution before the coupling reaction.
• the pigment suspension is optionally diluted with water and heated for 1 to 24 hours, especially 6 to 15 hours at a temperature above 80°C, especially of from 90 to 110 °C, very especially 98 to 102 °C at a pH above 5.5, especially 6.0 - 7.3, very especially 6.5 - 7.3.
• the pH is adjusted by addition of an acid, especially a weak acid, preferably acetic acid.
• the pigment is isolated from the suspension, washed, dried and optionally pulverized.
• the pigment of the invention is useful for pigmenting macromolecular organic materials of natural or synthetic origin, for example plastics, resins, coatings, paints or electrophotographic toners and developers and also inks, including printing inks.
• the pigment prepared according to the invention is useful for dyeing or printing hydroxyl- containing or nitrogenous natural organic and also synthetic substrates.
• substrates include for example synthetic or natural fiber materials and also leather materials comprising predominantly natural or regenerated cellulose or natural or synthetic polyamides.
• It is particularly useful for dyeing and printing textile material based on acetate, polyester, polyamide, polyacrylonitrile, PVC and polyurethane fibers and also wool or in particular cotton.
• the pigment can be applied to the textile materials by the usual exhaust, padding or printing processes.
• the pigment of the invention is useful as colorant in electrophotographic toners and developers, for example one- or two-component powder toners (also known as one- or two- component developers), magnet toners, liquid toners, latex toners, polymerization toners and also specialty toners.
• Typical toner binders are addition polymerization, polyaddition and polycondensation resins, such as styrene, styrene-acrylate, styrene-butadiene, acrylate, polyester, phenol-epoxide resins, polysulfones, polyurethanes, individually or in combination, and also polyethylene and polypropylene, which may each include further ingredients, such as charge control agents, waxes or flow assistants, or are subsequently modified with these additives.
• polyaddition and polycondensation resins such as styrene, styrene-acrylate, styrene-butadiene, acrylate, polyester, phenol-epoxide resins, polysulfones, polyurethanes, individually or in combination, and also polyethylene and polypropylene, which may each include further ingredients, such as charge control agents, waxes or flow assistants, or are subsequently modified with these additives.
• the pigment of the invention is further useful as colorant in powders and powder coatings, especially in triboelectrically or electrokinetically sprayable powder coatings used for surface coating of objects composed for example of metal, wood, plastic, glass, ceramic, concrete, textile material, paper or rubber.
• Powder coating resins used are typically epoxy resins, carboxyl- and hydroxyl-containing polyester resins, polyurethane and acrylic resins together with customary hardeners. Combinations of resins are also used. For instance, epoxy resins are frequently used in combination with carboxyl- and hydroxyl-containing polyester resins.
• Typical hardener components include for example acid anhydride, imidazoles and also dicyandiamide and derivatives thereof, capped isocyanates, bisacylurethanes, phenolic and melamine resins, triglycidyl isocyanurates, oxazolines and dicarboxylic acids.
• the pigment of the invention is also useful as colorant in inks, preferably inkjet inks, for example on an aqueous or nonaqueous basis, microemulsion inks and also in such inks as operate according to the hot-melt principle.
• Inkjet inks generally include a total of 0.5 to 15% by weight, preferably 1.5 to 8% by weight,
• Microemulsion inks are based on organic solvents and water with or without an additional hydrotropic substance (interface mediator). Microemulsion inks include 0.5 to 15% by weight, preferably
• Solvent based inkjet inks preferably include 0.5 to 15% by weight of one or more compounds according to the invention, 85 to 99.5% by weight of organic solvent and/or hydrotropic compounds.
• Hot-melt inks are based mostly on waxes, fatty acids, fatty alcohols or sulfonamides that are solid at room temperature and liquefy on heating, the preferred melting range lying between about 60 °C and about 140 °C.
• Hot-melt inkjet inks consist essentially for example of 20 to
• wax 90% by weight of wax and 1 to 10% by weight of one or more of the compounds according to the invention. They may further include 0 to 20% by weight of an additional polymer (as "dye solvent”), 0 to 5% by weight of dispersant, 0 to 20% by weight of viscosity modifier, 0 to 20% by weight of plasticizer, 0 to 10% by weight of tack additive, 0 to 10% by weight of transparency stabilizer (prevents crystallization of waxes, for example) and also 0 to 2% by weight of antioxidant.
• additional polymer as "dye solvent”
• dispersant 0 to 20% by weight of viscosity modifier
• plasticizer 0 to 20% by weight of plasticizer
• tack additive 0 to 10% by weight of tack additive
• transparency stabilizer prevents crystallization of waxes, for example
• antioxidant Typical additives and assistants are described for example in US-A-
• the pigment of the invention is also useful as colorant for color filters and also for additive as well as subtractive color generation.
• the solution is cooled with 40 g water and 91 g ice and treated with 45.3 g sodium hydroxide solution (30%) and 202 g ice and water.
• Half of the diazo solution (585 g) is treated with a solution of 25 g 5-acetoacetylamino-benzimidazolone in 42 g water and 25 g sodium hydroxide solution (30%) at 0 °C during 1 hour. 5 minutes after the coupling solution has been added a pH 5.8 is monitored.
• the orange yellow pigment suspension is heated to 20 °C, treated with additional 260 g water and heated to 99 - 100 °C for 15 hours (pH 7.2 - 7.3).
• anthranilic acid 13.7 g of anthranilic acid are stirred with 250 ml of water and 50 ml of 5N hydrochloric acid, and diazotized with 20 ml of 5N sodium nitrite solution. This diazo solution is poured at 25°C with stirring into an acetic suspension of the coupling component, which is prepared as follows: 24 g of 5-acetoacetylamino-benzimidazolone are stirred at room temperature with 200 ml of water, and dissolved by adding 60 ml of 5N sodium hydroxide solution.
• the solution was clarified by means of active charcoal, and the filtrate is added dropwise within 30 minutes while stirring to a solution of 30 ml of water, 41 ml of glacial acetic acid, 80 ml of 5N sodium hydroxide solution and 3 g of LUTEWSOL OW 50 (BASF AG).
• the suspension is heated to 95-97°C by introducing steam, and maintained for 3 hours at this temperature. At 60-70°C, the suspension is filtered, the press cake is washed free from salt, dried and ground.
• a 250 ml jar is charged with 100 grams of 2 mm diameter glass beads is charged with 2.50 g pigment obtained above, 0.85 g Disperbyk® 161 und 46.65 clear finish (Anreibelack AM90) (1 ).
• the mixture in the jar is shaken on a Skandex shaker (Skandex Disperser BA S20) for 2 hours (DIN 53238 Part 13).
• the millbase contains 5% pigment with a pigment/binder ratio of 1/9.
• a 100 ml jar is charged with 23.75 white finish (2.2) and 6.25 g of the above millbase formulation.
• the formulation is homogenously blended for 5 minutes in a mixer (Farbmischer FAS 500) and applied onto a white chart by means of a 100 ⁇ m rakel coater (Spiralrakel).
• the coating is air-dried for 30 minutes and then baked at 130°C for 30 minutes.
• the following color data are measured on the coated chart using a Minolta 360Od spectrophotometer equipped with the CGREC software: C. I. E. L * , C * , h color space value numbers using a D65 illuminant and 10° observer; color strength.
• Clear finish (1) C. I. E. L * , C * , h color space value numbers using a D65 illuminant and 10° observer; color strength.
• Alkydal F310 (60% in solvent naphta) 54.62 g
• Maprenal MF 650 (55% in iso-butylacetate) 23.50 g
• Silicone oil A (1% in xylene) 1.00 g

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inks, Pencil-Leads, Or Crayons (AREA)
• Paints Or Removers (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Plural Heterocyclic Compounds (AREA)
• Coloring Foods And Improving Nutritive Qualities (AREA)
• Developing Agents For Electrophotography (AREA)

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• 2007
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